Steam-boiler.



' PATENTED 513.11. 19,08.

W. d. PPEIPFER. sTBAMjBoILER. PPLIATION FILIED JUNE 4. 1905*.

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WILLIAM C. PFEIFFER, OF; CHICAGO, ILLINOIS.

STEAM-Bourin.

To allwhom it'ma'y concern: Be it known that I,.WILLIAMC. PFEIEFER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, `have invented` certain new and useful Improvements iniSteam-Boilers, of which the following isa-specification.

One of the objects ofthis inventionis the production. of an improved steam boiler adapted for Ihigh-pressure service.

`Anotherobject ofthe invention is the production of an externallyfi'red,.return-tubular boiler requirinor no inclosing brickwork.

'A further object is the production of an improved means for staying or bracingsteam boilers.

The invention further refersto thevarious other features of improvement hereinafter shown and described. p

In the accompanying drawings, Figure 1 is a vertical central longitudinal section through a steam boiler embodying the features of my invention. Fig. 2 is a rear end elevation of said boiler, a portion of the boilerbeing shown in section on the plane of dotted line 2 2 of Fig. 1. Fig. 3 is a transverse sectional view through the boiler on dotted line 3 3 of Fig. 1.

In the embodiment ,herein shown of this invention the boiler shell comprises two cylin.n drical sections l and 2 secured end to end, the rear section 2 being of greater kdiameter than the forward section 1. Within the forward end of the forward shell-section 1 is secured the tube sheet 3, and closing the forward end of said section is the wall 4. The tube sheet 3 and the wall 4 provide between them a smoke box 5 communicating with the smoke stack through the liue 6. The rear end of the rear shell-section 2 is closed by the tube sheet 7, and the forward end of said section is provided with a tube sheet 8 having therein a circular opening 9 adapted to receive the rear end of the forward shell-section 1. Said forward section 1 is secured to the sheet 8 by means of rivets 1() extending through the shell 1 and through an annular flange 1 1 formed integral with said sheet. As shown in Fig. 1, the rear end of the section 1 beyond the point of union with the tube sheet 8 is notched or cut away to provide a plurality of tongues 12 (in this instance, six in number), which tongues project into the rear secy tion 2 and furnish a means of attachment for stays 13 connecting the rear tube sheet 7 with `Specification of Letters Patent.

Application filed June 4. 1906. SerialfNo. 319981.

the rear-end of the section `1.

7 Patented Feb. l11, 190e.`

Said stays havesplit forward ends to receive the tongues 12, to which tongues they are attached `by means of the rivets14. The rear ends of the stays 13are of crowfoot form andare `securedto the head7 by rivets 15.

Tubes or fines-16 extend through the sections 1 and 2, saidy tubes being expanded into the tube sheets 3 and 7. Tubes 17 ,somewhat larger in diameterthanthe tubes 16, extend through the rear section 2 between the heads 7 and 8.

Communication between the rear ends of the sion19 of the rearsection 2 supporting a rear i' wall v20 of tile orbrickwork, and a top wall 21. Access to the flues 1.6 and. 17 for cleaning and repair is had through suitable doors (not shown) in the walls 4 and 20. A manhole 22 is formed in the rear tube sheet 7 above the flues 16, and handholes 23 and 24 in the lower portions of the tube sheets 3 and 7, respectively. Diagonal stays 25 are secured to the tube sheets 3 and 7 above the iiues 16, and to the upper part of the shellsections 1 and 2. In the lower side of the rear section 2 is provided a clean-out opening 26.

The furnace with which this boiler 1is herein represented as provided comprises the front wall 27, the rear wall 28 and the side walls 29. The forward end of the boiler is supported by means of lugs 3() resting upon the side walls 29, and the rear end of the boiler rests upon a pillar or standard 31 of any suitable form. The grate 32 extends between the front wall 27 and the bridge wall 33. As shown in Fig. 1, the bridge wall 33 is located a slight distance forwardly of the tube sheet 8, providing a space 34 between the rear end of the grate 32 and said tube sheet. Access to the space 34 for cleaning purposes is had through an opening 35 in one of the side walls 29, said opening being closed by a door 36. If desirable, a slide or shutter (not shown) may be provided in the door 36 for admitting air to the combustion chamber 37. One or more openings 38 are formed in the front wall 27 to give access to the combustion chamber 37, said openings being closed by suitable furnace doors 39. An opening 40 in the front wall 27 affords access to t e ash-pit 41, said opening being closed by the door 42. The rear shell-section 2 and the upper part of the section 1 may be provided With a non-conducting covering (not shown) of asbestos or other suitable material.

In operation, the products of combustion pass from the combustion chamber 37 through the ues 17, the chamber 18, the lues 16 and the smoke boX 5 to the smoke flue 6. The arrangement of boiler and furnace herein shown obviates the necessity for bricking in the boiler, the path of the products of combustion in passing from the furnace to the smoke outlet being entirely Within the boiler and the connect ng cham ber 18. It will be noted that the relative lengths of the shell-sections 1 and 2 are such as to provide space for the use of a large grate surface, thus giving the boiler large steam raising capacity. To enable it to carry comparatively high steam pressures, the boiler shell is made cylindrical throughout its length, and the heads or tube sheets are thoroughly stayedby means of the stays 13 and 25. The stays 13 being connected to the shell-section 1 at a point Within the shell 2 are not exposed to the intense heat of the fire. In cleaning the boiler a hose may be introduced into the handhole 23 and the interior of the 'boiler flushed, the mud and loose scale being discharged through the clean-out opening 26.

I claim as my invention:

1. In a steam boiler, in combination, a shell comprising two alined cylindrical sections, the forward'section being of smaller diameter than the rear section and projecting into said rear section, said rear section being provided With a rear tube sheet; and stays engaging said rear tube sheet and the in- Wardly-projecting rear end of said forward section.

2. In a steam boiler, in combination, a shell comprisingtwo alined cylindrical sections, the forward section being bf smaller diameter thanA the rear section and projecting into said rear section, said inwardlyprojecting rear end being notched to provide tongues; atube sheet for the rear end of said rear shell-section; and stays secured to said tube sheet and said tongues.

WM. C. PFEIFFER. 

